Effects of the astronomical orbital cycle on organic matter accumulation during the Late Ordovician–early Silurian in the Upper Yangtze area, South China

Min Xiong,Lei Chen,Xiucheng Tan,Xin Chen,Jian Zheng, Yang Yang,Cui Jing,Gaoxiang Wang

Journal of Asian Earth Sciences（2023）

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Abstract

•The 1.2 Myr long obliquity cycles drive the eustatic changes in the Upper Yangtze area.•The ATS gave durations of 1.49 ± 0.40 Ma, 1.73 ± 0.40 Ma for the Hirnantian and Rhuddanian Stage.•Paleoclimate and eustatic changes driven by Milankovitch cycles is the key for organic matter accumulation.

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Key words

Astronomical orbital cycle,Late Ordovician–early Silurian,Shales,Organic matter accumulation,Upper Yangtze area

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